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<br />ACZ Laboratories, Inc. August 10, 2007 <br />' Quality Assurance Plan Version 12 <br />SOPAD018.08.07.12 Page 43 of 96 <br />11.1.2 Positive Control <br />11.1.2.1 Laboratory Fortified Blank (LFB) <br />' An LFB is required for methods that do not include a Laboratory Control Sample but include <br />a fortified matrix (spike). The LFB is an aliquot of reagent water to which a known quantity <br />of each target analyte is added. It is treated exactly like a client sample, and its purpose is to <br />determine whether the methodology is in control, and whether the laboratory is capable of <br />making accurate and precise measurements. When the acceptance criteria for the LFB are <br />exceeded (i.e. high bias) then any associated client sample with a measured concentration <br />less than the MDL may be accepted and reported with the appropriate qualification. <br />11.1.2.2 Laboratory Control Sample [LCSW (Water) or LCSS (Soil)] <br />' The performance of both sample preparation and analysis of each sample batch may be <br />monitored by an LCS. The LCS is a matrix-specific standard (whenever possible) of known <br />analyte concentration(s) that may be prepared by the laboratory or purchased pre-made. The <br />' LCS must be carried through the entire preparation and analytical schemes with the client <br />samples. Analysis and evaluation of the LCS allows for confirmation of the applicability of <br />the preparation procedure to the analytes. Evaluate data using the following guidelines: <br />1) When only an LCSW is analyzed, the results must be within the acceptance limits <br />or the entire batch of samples must be re-prepped and retested. <br />2) An LCSW duplicate (LCSWD) may be prepared and analyzed with the batch, <br />typically in lieu of a matrix duplicate or spike duplicate. Data is acceptable if the <br />LCSW and/or LCSWD is within the acceptance limits and the RPD passes. <br />Associated samples must be re-prepped and reanalyzed if either of the following <br />' occurs: <br />¦ LCSW/D RPD fails the acceptance criteria specified in the SOP. <br />¦ % R of both the LCSW and LCSWD is outside the acceptance limits. <br />3) For a solid or semi-solid matrix, an LCSS and LCSSD are prepared and analyzed.' <br />The data is acceptable if the LCSS and/or LCSSD is within the acceptance limits <br />' and the RPD passes. Associated samples must be re-prepped and reanalyzed if any <br />of the following occurs: <br />' LCSS/D RPD fails the acceptance criteria specified in the SOP. <br />¦ % R of both the LCSS and LCSSD is outside the acceptance limits. <br />¦ MS/D RPD fails the acceptance criteria specified in the SOP (if applicable). <br />4) When the acceptance criteria for the LCS are exceeded [i.e. high bias] then any <br />associated client sample with a measured concentration less than the MDL may be <br />accepted and reported with the appropriate qualifier. <br />5) Refer to section 11.1.3.3 for additional information regarding data assessment for <br />solid-matrix workgroups prepared with both LCSS/LCSSD and MS/MSD. <br />3 Corrective action for Recommendation #5 cited in the 2002 ADHS audit report. <br />2773 Downhill Drive 970-879-6590 <br />Steamboat Springs, CO 80487 www.acz.com <br />